Folding paper cup



[June 21.1927. 1,632,867

C, BARBIERI FOLDING PAPER CUP Filed July 5. 1922 Uesare EWQQW? Patented .Iime 21, 1927.

UNITED STATES 1 "1,632,867 PATENT OFFICE.

CESARE BABBIERI, OF NEW YORK, N. Y., ASSIGNOR TO THE VORTEX MFG. 60., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

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} Application filed July 3, 1922. Serial No. 572,522;

This invention relates to a type of paper cup which when stored or packed 1s adapted to be folded .into a fiat form but when in use is rounded into a conical form.

It is an object of this invention to provide a flatpaper cup which can be opened out into. a conical cup with less pressure than has heretofore been required. 7 It is-a further object of this invention to 10 provide a fiat paper cup the sides of which,

when it is being opened into aconical cup.

.by pressure againsttheedges, will be -more certain to archaway from each otherinstead of archingin the same direction than. have such cups heretofore. g It is a further object of this invention to make a cup of the sort described in which the folds shall be unlikely to produce-narrow corners when the cup is usedfor drink- U in r 1 t isa further object ofthis inventlon to provide a cup of the sort described 1n which creased or score marks shall locate thelpoint at which the cup is to bend in the act of opening it.

Other and :inrther important objects of this invention will be -apparent from the disclosures in the accompanying drawings and in the specification; 80 The invention (in a illustrated in the drawings and more fullydescribed.

On thedrawings:

Figure 1 is a view of one. side of the on Figure 2 is-a view u n asmaller sca e of the opposite side of t e cup.

. Figure '3 is a view upon the same scale as Figure 1, showing the top of the cup in its folded condition.

Figure 4 is a view of the blank from which the cup is made.

Figure" 5 is a top fully open.

Figure; 6 is a top plan view of the cup partially open.

As shown on the drawings:

The cup is made from a blankhaving a curved edge 1 and a radial edge 2. The blank is approximately the shapeof a sector of a circle.- The other. radial edge of the sector, shown at 3, is not the edge of the blank but the blank continues beyond this edge to, form a flap 4 having 'an edge 5,

- which is approximately radial The end of 55 the flap 4 nearest the center of the "curve 1 preferred form) is hereinafter plan view of the cupthe blank have no actual I ,Figure 3.

may have its edge in line with "the radial edge 2 asshown at 6. 1

At the center of: the curve [lithe blank is providedwith a notch 7 ofageneral starshape, the edges of the star being curved and convex toward the notch. The points of the star are in line with the proposed folds in the finished cup. One of these points therefore inline with the line 3; the other .is in line with the bisector 8 of the sector.

The lines 3 and 8 may correspond to actual physical structure of the blank, such as scoring, creases or the like, or the maybe'mere-f, ly the proposed locations 0 the fold and physical structure 7 corresponding thereto. y I

Two other lines 9. and 1(1 shown inFigure 4 correspond toactual physical structure.

They may be score marks, creases or the like, creases being chosen for illustration in i The point of the cup near the'centerofthe. curve 1 is to be folded against the wallet the cup, as shown at 12 in Figure 2' The fold 13 which produces this effect gives rise to three short lines 14, 15 and 16, as seen in Figure 4. These lines are like the lines 8 and 3 as regards their correspondence to actual physical structure.

The space between the line 15 and the notch 7 is approximately triangular and is covered with adhesive, One face of the flap 4 is also covered with adhesive, as shown in Figure 4.. Preferably also the o osite face of the blank is covered with adhesive over an area corresponding to the area between the line 15 and the point of the on for securing the folded point 12 to the we 1 of the cup, as shown'in Figure 2;

In making the cup from the blank the first fold is along the line 8. "This brings the edge 2 to coincide with theline 3. The second fold is along the line 3. This brings the adhesive covered face of the flap 4 against theouter face of the mar in near the edge 2-. The folds along the line 8 do not intersect because the notch 7 has removed the material at the intersection. The

point resulting--from"t-hese -twofolds is final fold 13 of the cup is made after the seam between the flap 4 and the margin near the edge 2 has become firm.. When this fold has, been secured in place the cup isfinished and ready to be packed. 11'0 When the cup is to used, the'folded edges 3 and8 are pressed toward one another. i The creases 9 and 10; respond to this. pressure sooner than the body of the mate-.-

rial. Consequently, before this material flexes :to any great extent elsewhere, the

creasesgive rise to'angles in the sides of the cup, as illustratedin Figure 6, inwhich the 1 two triangular faces of the cup are plane and the two quadrilateral faces are slightly twisted, owing. to the fact that their upper edges are -not in the same plane with the fold 13. When the pressure is continued to open the cup more fully, the twisted faces become markedly rounded, asshown in Figure 5, but the triangular faces continue to be nearly plane, or theynnay evenubecome slightly concave. i r

.- A very slight presusre, is suificient to bring the cupfrom the flat form shown in Figure 3 to a form like thatshown in Figure 6 because the natural tendency of the creases to make the paper fiex at the lines 9 and 10 gassists that pressure. A ,greater pressure is needed to complete the rounding of the cup because it must act to arch the material. If desired, the map may be opened as far as slight pressure will open it and then'filled.

plane and nearly tangent to t he weightof'the waterwill then quickly T brivre gl the cup to its fully rounded form.

enlthe cup is brought to the fully rounded for1n,'there are nosharpangles" left near the folds 3 and 8 because of the effect of the creases 9 and 10 in insuring a portion of the wall of the cup being nearly e curved part of these folds. The upper edge of the cup,

therefore, presents no placewhere it will .not readily fit the mouth of the user in the and the convenience of the act of drinkin cup is increased thereby.

purpose limiting the patent granted other,-

wise than necessitated by the prior art.

I claim as my invention:

1. A foldable cup, comprising two sides each the shape of, a truncated sector, each of said sides havin a single crease extending from pointsin t e curved edge of the cup to opposite ends "of said truncated edge, said sides when folded'fiat registering with each other.

2. A foldable paper cup, comprising two sides, each having approximately the shape of a circular sector with the oint truncated, the. truncating being done y folding said points againstione'side of the'cup, each of said sides having a single crease extendin from the'curved edge to'opposite ends of'sai fold, the convex side of said crease being outward, said sides when folded fiat registering with each other.

3. A foldable cup having a linear bottom,

a triangular face terminating at each end of the bottom, and a quadrilateral face at each side ofsaid bottom, said four faces constituting the walls of the cup, said triangular faces when said cup is flattened lying u on from points in the curved edge ,of the cup to opposite ends of said truncated edge.

In testimony whereof I havehereunto subscribed my name.

onsann BABBVIERI. 

